#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<stdlib.h>
int main()
{
  printf("begin:我是一个进程,pid:%d,ppid:%d\n",getpid(),getppid());
  pid_t id = fork();
  //int id = fork();
  if(id == 0)
  {
    //子进程
    while(1) {
      printf("我是子进程，pid: %d,ppid:%d\n",getpid(),getppid());
    sleep(1);
    }
  }
  else if(id > 0)
  {
    //父进程
    while(1)
    {
      printf("我是父进程，pid:%d,ppid:%d\n",getpid(),getppid());
    sleep(1);
    }

  }
  else{
    //error
    printf("error");
  }

  return 0;
}
